Grooving tool



Feb. 24, 1953 A. H. NOLDE ETAL GROOVING TOOL Eiled Sept. :5. 1948 I'INVEN TOR. 141 NOLDE 04.17. qz/A 541/4300 Patented Feb. 24, 1953wauwatos'a, Wise, assignors to The Falk Core poration, Milwaukee, Wis.,a corporation of Wisconsin Applicatiofisepten'iber 3, 1948, Serial N 0.47,686

The present invention relates'generally to improvements in tools forforming internal grooves in bodies, and relates more specifically toimprovements in the construction and operation of tool assemblages forcutting annular recesses or grooves Within the bores of diversearticles.

' The primary object of our invention is toprovide an improved:grooving: tool assembly which is: simple and compact in construction,and which is also highly effic-ient in operation;

Another object of; thisinvention is toprovide animproved boring barfixture adapted; to auto-- matically and rapidly cut annular recesses ofpredetermined depth. within. the bores of; various kinds of work; i

A further object of. the invention is to provide an improved.mechanismrfor gradually and efiectively feeding? the-cutter! ofJa-Lboring bar out' wardly away from and inwardly toward the bar axis.

Still another object oiiourinvention" is to provide an improved cuttingtool holderand feeding device for boring bar assemblages, which isdurable inrconstruction and. dependable" in operation';

Anradditionali objectiof the present invention isto provide aspre'cisiongrooving tool assembly,v which may be: conveniently applied tororremoved from a boring bar or the. like; and: all parts of which are"well" protected against damage while being readily accessible forinspection.

These and: otherbbjects ofuthe invention will be apparent': from the:ufollowing detailed de-r scriptiom i A clear conception oftheconstructionandoperation or a" typical embodiment of our: invention,may be hadby'referring' to the drawing accompanying and forming a partof this specification, wherein like reference characters designate thesame or similar parts in the various views.

Fig. 1 is a part sectional si'de elevation of one oftheimproved'grooving tool mechanisms showing the same applied to a fragmentof a boring bar, and in the act of cutting an annular groove;

Fig. 2 is a transverse section through the as semblage of Fig. 1, takenalong'the line 22 and viewedin the direction of th'e'arrows; and

Figr-B is" another-transversesection through the same assemblage;takenalong the irregular line 3--3 and viewed in the direction of thearrows shown in Fig. 1.

Wilhile the invention has" seen" shown" and described 'as having beenembodied in atypical rotary boring bar assemblage wherein the bar isadapted to revolve a cutter in order to produce 2 cla ms. (01. 77-57 1an internal groove in the work, it is not our desire or intention tounnecessarily limit the scopeor utility of the device byvirtue of thisrestricted embodiment,and it is also contemplated that specificdescriptive terms used herein be given the broadest possibleinterpretation con sistent with the disclosure. I

Referring to the drawing, the elongated cylindrical boring bar 4 isrotatable about a fixed axis in any convenient and well knownmanner, andis provided with a local transverse throughopening 5 within which-abearing element 6 having a transverse guide slot l therein, is f xedlybut rem-ovably confined as bykeys B. A cutter c'arry ing block 9 towhich cutters I 0 of any desired length and shape may be secured bymeans of set screws II, i snugly but slidably confined within the guideslot 1 of the element 6, and: one side of this block 9 is provided withopposite ar cuate end abutment surface 12, and with a cell tral recess[4 with which a stop crew l5 care tried by the-element 6 coacts so astoprevent the block 9 from falling out of the slot 1,.see Fig.- 1

An annular sleeve or driven member [6 snugly embraces and is journalledfor rotationupon the periphery of the bar 4 and hasitsend adjacent tothe cutter It provided with an eccentric bore 11 which slida-bly engagesboth of the abutment surface [2, While its opposite end is providedwith: an annular set of gear teeth I 8. Another annular sleeve ordrivingmember l9 likewise snuglyembraces thevperiphery of: the bacl cO-axiallyofi the'member l6; and has its end ad acent to: the member 16provided: with an annular set'of teeth 2 I]; while its opposite end 21is slotted; tapered and externally threaded as shown: for the receptionof? aninternally threaded andlta pered clamping collar 22- adapted tosecure: the member I 6: to the bar 4 so as to rotate therewith. Thenumber of teeth: 26 in: the drivingi'member seti slightlygreater thanthe number ot teeth 18; the: driven member set, but these teeth 18; dilare of like iormation and-have similar char; acte'ristics; V

A lanetary pinion 24- has teeth-2 5* which CU- act with the teeth It; 20of both annular 'setsl and this pinion 24 also" hasiiitegral 'stilbsmarts 26 at its opposite ends which are journaiied fer rotation inseparablesections 2-7, 28 of alien'sing. The housing section 21 issiipported the driving: member 19 through a bearing s1 1 29, and the twosections 2-1 2 8are firmlv'buii detachably ur-iitedby means ot screws30; but

the members l6, l9 are freely rotatable within the pinion supportinghousing so that the latter may be held stationary whenever desired. Thepinion shafts 26 are journalled in alined bearings 3I carried by thehousing sections 21, 28 and the housing is fixed against axial shiftingrelative to the members I9, I6 by means of snap rings 32. The interiorof the gear and pinion housing may be filled with grease which isprevented from escaping by a sealing ring 34.

When the improved mechanism has been properly constructed and assembledas above described, it may be utilized to cut annular internal grooves35 of predetermined depth intothe bores 36 of diverse articles or bodies3'! such as shown in dot-and-dash lines in Fig. 1, in the followingmanner. The cutter I carried by the block 9 should first be retracted soas to permit the boring bar 4 and the body 31 to be properly relativelypositioned in order to cut the groove 35 at the desired location. Thering 22 should then be rotated soasto firmly clamp the driving member I9to the bar 4, whereupon rotation of the bar will be imparted to themember I9. If the housing sections 21, 28 are not held and are permittedto revolve with the bar 4 and member 9, the driven member I6 will merelyrevolve at the same speed a that of the bar 4, so that the block 9 andcutter II] will not move relative to the rotating bar.

However, when the pinion housing is held stationary, the revolvingdriving member I9 will rotate the pinion 24 and the revolving teeth 25thereof will impart differential rotation to the driven member I6 thuscausing this member to V revolve slowly about the bar 4 and relative tothe other member I9. This differential speed is produced by thedifference in number of the teeth I8, 20 of the two series and sincethis difference is slight, amounting to only one or two teeth, therotation of the member I6 relative to the boring bar 4 will be positivebut slow. This relative rotation of the sleeve member I will obviouslycause the eccentric bore I! to revolve about the boring bar axis andsince this bore I! constantly should be apparent that our presentinvention in fact provides a grooving tool assemblage which besidesbeing simple, compact and durable in construction, is convenientlymanipulable and efficient in operation. The improved boring bar fixturemay obviously be readily assembled or dismantled, and functionsautomatically to accurately cut the grooves in rapid succession. Thecutter I0 is fed into the Work gradually but positively, thus producingsmooth cuts and avoiding tearing of the metal, and all parts of theimproved assemblage are of sturdy construction and are well protectedagainst possible damage. The various parts of the cutter feedingmechanism may also be readily constructed, and conveniently replaced bymodified parts adapted for the performance of different types ofgrooving.

It should be understood that it i not desired to limit this invention tothe exact details of construction or to the precise mode of operation,herein shown and described, for various modifications within the scopeof the appended claims may occur to persons skilled in the art.

We claim:

1. An internal grooving tool comprising a supporting bar, a tool carriertransversing saidbar and guided therein for feed movement transverselythereof, said carrier having means for supporting a tool in position toproject laterally beyond said bar, said carrier also having oppositelydirected abutments adjacent opposite ends thereof, a camming deviceencircling said bar and rotatable relative thereto, said cammingdesnugly engages both of the arcuate abutment surfaces I2-of the block9, this block together with the tool or cutter II) will first be movedout-. wardly to cut the groove 35 and thereafter inwardly to retract thecutter into the bore 36.

r In this manner, successive grooves 35 of definite depth and ofpredetermined shape dependent upon the selected shape of the cutter I 0,may be rapidly and automatically produced. The depth of these grooves 35may be changed by varying the eccentricity of the bore I1, and this boreI! may be withdrawn from the abutment surfaces I2 of the sliding block9, by merely releasing the clamping collar 22 and by thereafter slidingthe members I6, I9 along the bar 4 away from the block 9. When the block9 has been thus released from the member I6, the keys 8 may be drivenout, whereupon the bearing element 6 maybe withdrawn from the opening 5so as to make the retaining screw I5 accessible. Upon release of thescrew I5, the block 9 may be freely withdrawn from the slot I thuspermitting release of the cutter clamping screws II and removal of thecutter I0. The dismantled assemblage ,may be just as convenientlyre-assembled by reversing these operations; and the gearing is alsoreadily accessible by merely releasing the screws 30 whichnormally'unite the housing sections 21, 2B. 7

From the foregoing detailed description it vice having an eccentriccircular cam surface in.

contact with both of said abutment at diametrically opposite points onsaid surface so as to positively control the longitudinal position ofsaid carrier relative to said bar, and differential mechanism forcontrolling relative rotation between said camming device and. said bar.

2. An internal grooving tool comprising a supporting bar, a tool carriertransversing said bar and guided therein for feed movement transverselythereof, said carrier having oppositely directed abutments adjacentopposite ends thereof, a camming device encircling said bar and havingan eccentric circular cam surface in contact with both of said abutmentsat diametrically opposite points on said surface so as to positivelycontrol the longitudinal position of said carrier relative to said bar,two concentric gears connected to said bar and camming devicerespectively, a planet member in meshing engagement with both of saidgears, and a planet carrier rotatable about said bar for effectingrotation of said.

camming device relative to said bar.

ARTHUR H. NOLDE.

ANTHONY D. GUAGLIARDO;

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS l 570,703 Germany Jan. 4, 1939

